28128194738 has 16 divisors (see below), whose sum is σ = 50757645120. Its totient is φ = 11420469936.

The previous prime is 28128194683. The next prime is 28128194749. The reversal of 28128194738 is 83749182182.

28128194738 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28128194738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52872281 + ... + 52872812.

It is an arithmetic number, because the mean of its divisors is an integer number (3172352820).

Almost surely, 2^28128194738 is an apocalyptic number.

28128194738 is a deficient number, since it is larger than the sum of its proper divisors (22629450382).

28128194738 is a wasteful number, since it uses less digits than its factorization.

28128194738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105745121.

The product of its digits is 1548288, while the sum is 53.

The spelling of 28128194738 in words is "twenty-eight billion, one hundred twenty-eight million, one hundred ninety-four thousand, seven hundred thirty-eight".